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The $15 tool worth buying first.

by Dr. Angila Jaeggli

My one-page guide to your indoor humidity number, the range to aim for, and when to act

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Before you spend money on tests, I want you to measure the air you breathe every day. One number tells you a lot. You can't feel the difference between 45% and 60% humidity, but a small digital hygrometer can.

I made this one-page cheat sheet to help you understand that number. Inside, I explain why mold control is moisture control, and I walk you through the three numbers I come back to: the range to aim for indoors, the reading that is worth acting on, and how long water can linger before mold can take hold. You'll see where to place the hygrometer, how to read it well, and the small daily habits that help hold the line through a wet season. At the bottom, a one-week log lets you track three rooms side by side.

If you can't keep your home under 50% despite your best efforts, that is useful information. Bring the log to your provider or inspector.

Educational content only, not medical advice.

Outcomes

  • Understand why mold control is moisture control
  • Know the indoor humidity range to aim for
  • Spot the reading that is worth acting on
  • Learn where to place a hygrometer and how to read it
  • Track three rooms for a week and bring the log

What's included?

  • Why it matters.

    How humid indoor air, cold windows and walls, and damp materials that never fully dry create the conditions where mold can take hold.

  • The three numbers.

    30–50% as the indoor target, 50%+ as the warning sign, and the 24–48 hour moisture rule for spills and leaks.

  • Using it well.

    Where to start, when to read it, and why trends matter more than any single reading on an inexpensive unit.

  • Small habits, daily.

    Wet-season habits for bathrooms, kitchens, laundry, and basements, wherever the air stays damp and the windows stay shut.

  • Your weekly log.

    A printable one-week log for your living area, bedroom, and dampest room, with space for notes.

Who is this for?

  • You'd rather measure first. You want real information about your home before you spend money on testing.
  • Your symptoms come back with the rain. The windows close, the heat goes on, and you want to know whether your home's humidity is part of the picture.
  • You're preparing for a visit or an inspection. You want a week of readings on paper to bring to your provider or inspector.

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About the creator

Dr. Angila Jaeggli picture

Dr. Angila Jaeggli

Naturopathic physician, educator, and founder of Sage Integrative Medicine Clinic

I'm Dr. Angila Jaeggli, ND, a naturopathic physician, educator, and founder of Sage Integrative Medicine Clinic. I write free, practical guides on integrative medicine, hormones, peptides, longevity, and mold, for women who want to walk into their ne...

The $15 tool worth buying first. | Circle Discover